I'm learning how to using teiid 7.4,jboss 5.1 and jbds 4.1 to establish a vdb environment, but when i preview data , the error validate JDBC username and password show as the screenshot 1.

I know all the version were so old ,but i'm really need to help , I'm a chinese engneer, my company's vdb project was done by other people .but they left office before i came . And They leave very little documentation. I ‘m a new hand about this. I've been worried about this for a few days.

In Teiid Server connection dialog box, the URL you are using to connect to the Teiid Server has "mms://.." it needs to be "mm://". No 's' in the end, s stands for secure, and your server does not seem to be secure or server not started.